There are numerous ways to make effective sound barriers. This article talks about utilizing soundproofing materials which provide low cost sound damping in remodels and new construction. Viscoelastic damping materials used between rigid panels such as drywall or plywood create a constrained layer damping (CLD) system. A specific, lab-tested VE damping material should be used, not construction adhesive or simple silicone caulk. with include; gypsum board (aka: sheetrock and drywall), plywood, metal, and various woods, typically adding 15 to 20dB of sound isolation. There are numerous ways to make effective sound barriers. Below are some typical applications and instruction.

Steps

1

Construct the framing as normal. Your results will be improved if the framing is decoupled. Also consider a bit of insulation in the wall if there's none there now.

2

Install a sheet of drywall to the frame.

3

Before installing the next sheet apply acoustical sealant around panel perimeter and around any electrical boxes.

4

Then install the adjacent sheet of drywall, making sure to remove any excess acoustical sealant with a rag or putty knife as needed.

5

Repeat steps 2 through 4 until wall or ceiling is completely covered.

6

Prepare to apply the second layer of drywall. Cut the drywall to fit around any electrical boxes or openings as needed.

7

Make sure the drywall surfaces are clean and free of loose fibers like sawdust.

8

Apply the damping material per the manufacturer's directions. This is generally a 3/8" bead of the damping material applied to the back of the second drywall layer.

9

Next, place the coated sheet over the already installed drywall and screw to framing members. Damping glue will thus be sandwiched between 2-layers of drywall. It is important to screw (not nail) the second sheet of drywall to the original studs or joists to compress the damping compound. Damping glue is not a structural adhesive... you need screws to secure.

10

Install the adjacent sheet of drywall being sure to remove excess acoustical sealant with a rag or putty knife as needed. Please note: acoustical sealant will remain viscoelastic, i.e. not dry, so it is necessary to tape and texture over these joints. Please see acoustical sealant instructions for more detailed information.

11

Repeat steps 6 through 11 until wall and or ceiling is completely covered.

12

After the drywall is in place, apply dry-wall mesh tape along the joints between the two pieces of drywall. The mesh tape helps hold drywall compound in the gap. Use a wide drywall knife to spread joint compound over the mesh tape. Don't try to fill the entire gap all at once; apply a little at a time, and allow it to dry before applying a second coat.

13

Cover the screw heads with drywall compound.

14

Allow the joint compound to dry, then sand it smooth. Wear breathing protection during this step because the process generates a lot of dust.

15

Apply a second coat of drywall compound, allow it to dry, and sand it smooth. Repeat the process as necessary until the wall is perfectly smooth, then finish the walls as desired.